Titanium doesn’t tarnish from air, soil, or salt. It is a poor conductor of heat and electricity, and doesn’t become hot or pose electric risks on anyone’s finger. It’s not scratch proof, but it is scratch resistant, and most scratches can be easily buffed out and the ring re-polished. If you want to add an engraving, commercial titanium can be worked with and repaired. It can also be cut off during an emergency using standard tools. Some jewelers also make rings and other jewelry from aircraft grade titanium. This titanium alloy is enhanced with traces of other metals to boost its strengths to levels that may be unnecessarily high for most wedding bands. Aircraft grade titanium sets permanently. It can’t be repaired, engraved, resized, or cut off by standard tools in an emergency situation. If your future hubby needs something that can literally stand up against all damage - no matter what - then maybe aircraft grade titanium isn’t too much.